Abstract(Ge 0.2 Se 0.8 ) 100-x In x and (Ge 0.17 Se 0.83 ) 100-x In x (x = 0, 5, 10, 15 at.%) chalcogenide glasses have been studied with high-energy x-ray diffraction, neutron diffraction and extended x-ray absorption spectroscopy at Ge, Se and In K-edges. The experimental data were modelled simultaneously with the reverse Monte-Carlo simulation method. GeSe 4/2 tetrahedra are shown to be the main structural units in the binary and ternary glasses investigated. Indium bonds to the excess Se atoms in the ternary Ge-Se-In glasses. While majority of In atoms have three Se neighbours, some In atoms may be tetrahedrally coordinated by Se.
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